CONTENTS. 



(A) 

 VOL. 209. 



List of Illustrations page vi 



Advertisement vii 



I. On the Atomic Weight of Chlorine. By EDWARD C. EDGAR, D.Sc., the University, 

 Manchester. Communicated by Prof. H. B. DIXON, F.R.S 



II. On Scandium. By Sir WILLIAM CROOK ES, D.Sc., F.R.S. ...... 15 



III. The Spectrum of Scandium, and its Relation to Solar Spectra. By A. FOWLER, 



A.R.C.S., F.R.A.S., Assistant Professor of Physics, Imperial College of 

 Science and Technology, South Kensington. Communicated by Sir WILLIAM 

 CEOOKES, D.Sc., F.R.S. . . . . : ............ 47 



IV. On the Nature of the Streamers in the Electric Spark. By S. R. MILNER, 



D.Sc. (Lond.), Lecturer in Physics in the University of Slicffield. Communi- 

 cated by Prof. W. M. RICKS, F.R.S. ............ 71 



V. Eutectic Research. No. 1. The Alloys of Lead and Tin. By WALTER ROSEN- 



HAIN, B.A., B.C.E., ivith P. A. TUCKER. (From the National Physical 

 Laboratory.) Communicated by R. T. GLAZEBROOK, M.A., F.R S. . . 89 



VI. The Emission and Transmission of Rontgen Rays. By G. W. C. KAYE, B.A. 



(Cantab.}, B.Sc. (Lond.}, A.R.C.Sc., Associate-Member of the Institution of 

 Electrical Engineers, Trinity College, Cambridge. Communicated by Prof. 

 J. J. THOMSON, F.R.S. ................ 123 



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